I've played this game 3 times through since it came out, and I've loved it every time. Emotionally impactful, beautiful environment and graphics, awesome soundtrack, and some of the best voice acting I've ever heard in a video game. I have tried to think of something to criticize the game on, but I can't. Some people talk about the puzzles being repetitive, or that it's basically a 'walking simulator'. I can see how some might come to this conclusion, however, I for one believe that even the repetitiveness of the puzzles and the more 'boring' times of the game have a significant purpose and meaning behind them. This game will terrify you. It will possibly enrage you. You'll feel anxious and tense. It can be boring at times. It will uplift you, and pull you down quite literally to the pit of hell before it's all over. It's a complete experience, and I give it my highest recommendation.
P.S. 1 of only 2 games to ever make me cry.